你如何以及在哪里使用instantiateViewControllerWithIdentifier

Question

UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard"
                                                     bundle: nil];

MenuScreenViewController *controller = (MenuScreenViewController*)[mainStoryboard 
                                               instantiateViewControllerWithIdentifier: @"<Controller ID>"];

如果我必须确保使用标识符实例化当前视图,我究竟在哪里编写此代码？这意味着如果我在这个类上编写任何代码,它必须在这个viewcontroller加载时出现？我也将如何使用它？我不想创建menuscreenviewcontroller的实例.这意味着我必须说自己,但我使用self.view,但这不起作用.

Answer 1

您需要推送或显示已创建的视图控制器.您无法通过实例化直接更改控制器的视图.

例如,您需要使用此代码来触发转换(可能是按钮操作):

MenuScreenViewController* controller = (MenuScreenViewController*)[ourStoryBoard instantiateViewControllerWithIdentifier:@"<Controller ID>"];

controller.controlFlag = YES;
controller.controlFlag2 = NO; // Just examples

//These flags will be set before the viewDidLoad of MenuScreenViewController
//Therefore any code you write before pushing or presenting the view will be present after 

[self.navigationController pushViewController:controller animated:YES];
// or [self presentViewController:controller animated:YES];